Messages in this thread | | | Date | Thu, 7 Dec 2006 15:45:45 -0800 | From | Pete Zaitcev <> | Subject | Re: single bit errors on files stored on USB-HDDs via USB2/usb_storage |
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On Thu, 07 Dec 2006 20:41:12 +0100, Matthias Schniedermeyer <ms@citd.de> wrote:
> >>I'm using a Bunch auf HDDs in USB-Enclosures for storing files. > >>(currently 38 HDD, with a total capacity of 9,5 TB of which 8,5 TB is used) > >>[....] > >>This time i kept the defective files and used "vbindiff" to show me the > >>difference. Strangly in EVERY case the difference is a single bit in a > >>sequence of "0xff"-Bytes inside a block of varing bit-values that > >>changed a "0xff" into a "0xf7".
> > This was almost certainly caused by hardware flaws in the USB interface > > chips of the enclosures. There's nothing the kernel can do about it > > because the errors aren't reported; all that happens is that incorrect > > data is sent to or from the drive. > > So pretty much all ich can do is to pray that the errors don't corrupt > the Filesystem-Metadata (XFS).
No, this is not all. You should buy a variety of different enclosures with different chipsets (e.g. find a Freecom if you can), and also use decent cables.
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